JPH08114749A - Lens barrel - Google Patents

Abstract

PURPOSE: To minimize the width size of a lens barrel and to accurately measure an observation image by carrying a prism so that it can be inserted and pulled out with respect to an optical path and directly guiding the observation image coming from an objective lens to the other observation part in a state where the prism is not positioned on the optical path. CONSTITUTION: By a triple-lens barrel main body 11, a binocular lens barrel 112 for guiding the observation image to the binocular observation part and a cylindrical part 113 for guiding it to the other observation part such as a silver-salt camera are formed with respect to a bottom surface 111 holding an image forming lens 12 condensing the light of the observation image coming from the objective lens. By a carrier 15 movably provided along a dovetail groove 111 a formed on the bottom surface 111, the prism 16 for guiding the observation image to the binocular observation part is held on a vacant hole 151 formed at the central part thereof so that it can be inserted and pulled out with respect to the optical axis of the lens 12 by an operation lever 17. By directly guiding the observation image fetched by the objective lens in such a state where the prism 16 is not positioned on the optical path by the carrier 15, the wavelength of observation light is prevented from being restricted and transmissivity is prevented from being attenuated and the observation image is prevented from being distorted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel of a microscope having a binocular part for binocular observation and an observing part for a silver salt camera or a television camera.

[0002]

2. Description of the Related Art Conventionally, as a lens barrel of a microscope, there is one having an inverted optical system capable of taking a picture with a silver salt camera or a television camera in addition to binocular observation.
No. 20 publication.

In such a lens barrel, in addition to the first prism that guides the total light amount of the observation image to the binocular part, the first prism that guides the total light amount of the observation image to the binocular part and the observation part such as a silver halide camera or a television camera. Two
And a third prism that guides the total amount of light of the observed image to the observation section such as a silver salt camera or a television camera.

As shown in FIG. 8, the barrel including the first to third prisms holds these first to third prisms 1, 2 and 3 in a common frame 4 and Frame 4
By sliding in the direction of the arrow in the figure, the prisms 1 to 3 are positioned on the optical path 5 as shown in FIGS.

In this case, the first prism 1 is shown in FIG.
As shown in (a), the observation image from the objective lens is totally reflected by the mirror-coated upper surface 1a and further totally reflected by the lower surface 1b to guide the total amount of light to the binocular portion. , The first prism 1 as shown in FIG.
Is a half prism in which a triangular prism 6 is joined to the upper surface 1a of the first prism 1 and the junction is semi-transmissive, and an observation image from the objective lens is formed on the upper surface 1a and the lower surface 1b of the first prism 1. The light is reflected and guided to the binocular part, and also guided from the upper surface 1a of the first prism 1 through the prism 6 to the observation part such as a silver salt camera or a television camera. (C)
As shown in, the observation image from the objective lens is made to go straight as it is, and the total amount of light is guided to the observation section such as a silver salt camera or a television camera.

On the other hand, recently, there has been a technique using a lens barrel of an established optical system as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 61-15116 for the injection operation of cells by the manipulation of living things and the inspection of semiconductors. This lens barrel
As shown in FIG. 10, the first to guide the observation image from the objective lens
In addition to the prism 7, the second prism 8 is arranged to guide the formed image to the binocular observation unit.

[0007]

However, in the lens barrel having the inverted optical system, the first to third prisms 1, 2 and 3 are accommodated in the lens barrel, and the lens barrel width is five times as large as that of the prism. In need. Therefore, the width of the lens barrel is increased,
There is a possibility that the lens barrel may become large and the stability may deteriorate. In particular, when the objective lens has a high magnification, the problem of stability appears remarkably. Moreover, if the lens barrel becomes large and projects laterally, the visibility of the operating portion of the microscope is impaired. Further, the lens barrel having the erecting optical system has the second prism next to the first prism for guiding the observation image to the binocular observation unit as shown in FIG. There was a problem that it jumped out laterally.

On the other hand, in the recent fluorescence observation method of a microscope, the fluorescence in the ultraviolet to infrared region of the sample is often observed / measured, and the observation in the microscope (including the lens barrel) is often performed. There is a need to reduce light loss.

However, the prism shown in FIG. 9 (c) described above is provided in the lens barrel to correct the optical path difference between the binocular observation section and another observation section, which occurs when switching between FIGS. 9 (b) and 9 (c). However, this prism limits the wavelength of the observation light and attenuates the transmittance of the observation light, so that the prisms 3 shown in FIG. 9 (c) have surfaces 3a and 3b perpendicular to the observation optical axis. The observed image emitted from the objective lens is distorted due to surface accuracy, and the observed image emitted from the objective lens is the prism 3 shown in FIG. 9C.
However, there is a problem in that the observation image entering the silver salt camera or the television camera is deteriorated due to the measurement error.

The present invention has been made in view of the above circumstances. The width dimension of the lens barrel can be minimized, the wavelength of observation light can be limited, the transmittance can be attenuated, and the distortion of an observation image can be prevented. It is an object of the present invention to provide a lens barrel that can realize highly accurate observation image measurement.

[0011]

SUMMARY OF THE INVENTION The present invention provides a microscope having a binoculars tube for guiding an observation image taken from an objective lens to a binocular observation section and a lens tube for guiding the observation image to another observation section. The prism includes a prism for guiding the observation image that is inserted and taken in from the objective lens to the binoculars barrel, and a carrier that holds the prism and that can be inserted into and removed from the optical path. The body is configured to guide the observation image captured by the objective lens directly to the other observation unit in a state where the prism is not positioned on the optical path.

Further, in the present invention, the carrier is constructed so that the prism can be inserted into and removed from the optical path in response to the operation of the operation lever. Further, the present invention is a microscope having a binoculars tube for guiding an observation image taken from an objective lens to a binocular observation section and a lens tube for guiding the observation image to another observation section,
A first erecting optical system for guiding an observation image inserted in the optical path and taken in by the objective lens to a binocular barrel
And a second prism, and a carrier for holding the first prism and allowing the first prism to be inserted into and removed from the optical path. The observation image taken in by the objective lens without being positioned on the road is directly guided to the other observation unit through the space between the first and second prisms.

[0013]

As a result, according to the present invention, the prism for guiding the observation image, which is inserted into the optical path and taken in from the objective lens, to the binocular barrel is held on the carrier that can be inserted into and removed from the optical path. With this carrier, the observation image taken in from the objective lens is directly guided to another observation section in a state where the prism is not positioned on the optical path. As a result, the prism that was inserted to correct the optical path difference from the conventional binocular observation part is removed, and the wavelength limitation and transmittance of the observation light due to the optical path correction prism can be attenuated and the distortion of the observation image can be prevented. Also, the width of the lens barrel can be reduced.

Further, according to the present invention, the prism can be inserted into and removed from the optical path according to the operation of the operation lever, so that the operation can be simplified. Further, according to the present invention, the first prism of the first and second prisms constituting the erecting optical system for guiding the observation image inserted into the optical path and taken in from the objective lens to the binocular barrel Is held on a carrier that can be inserted into and removed from the optical path.
The observation image taken from the objective lens is directly guided to the other observation section through the space between the first and second prisms in a state where the prism is not positioned on the optical path. Also in this case, the wavelength limitation and the transmittance of the observation light due to the optical path correcting prism can be attenuated, the distortion of the observation image can be prevented, and the space between the first prism and the second prism can be utilized, so that the second prism can be used. The prism can be arranged as close as possible to the first prism side on the carrier, whereby the lateral width of the lens barrel can be reduced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a side cross section of a trinocular tube applied to a microscope according to the first embodiment. In the figure,
Reference numeral 11 denotes a trinocular tube main body, and the trinocular tube main body 11 is for binoculars for guiding an observation image to a binocular observation part with respect to a bottom surface 111 holding an imaging lens 12 that collects the observation image from the objective lens. A tube 112 and a straight tube portion 113 for guiding to another observation section such as a silver halide camera or a television camera are formed.
In this case, a prism 131 and an eyepiece sleeve 13 for dividing the observation image incident on the binocular observation part into binoculars are provided at the tip of the binocular tube 112, and a camera mount 14 is provided at the tip of the straight tube part 113. ing.

On the bottom surface 111 of the three-lens-barrel main body 11, a carrier 15 which is dove-bonded to the dovetail groove 111a is provided.
It is provided so as to be movable along a. This carrier 15 is
A hole 151 is formed in the center, and a prism 16 for guiding an observation image to the binocular observation unit is held on the hole 151 in the center. Further, the carrier 15 is provided with an operation lever 17 as shown in FIG. 2 penetrating the side wall of the trinocular tube main body 11, and by operating the operation lever 17, the carrier 15 is moved along the dovetail groove 111a. The prism 16 is moved so that it can be inserted into and removed from the optical axis of the imaging lens 12.

Next, the operation of the embodiment thus constructed will be described. First, when the operation lever 17 is operated so as to be pushed into the trinocular tube body 11, the prism 16 on the carrier 15 is positioned on the optical axis of the imaging lens 12, as shown in FIG. Like As a result, the observation image from the objective lens is condensed by the imaging lens 12, then reflected by the prism 16 and guided to the binocular barrel 112 side, and the binocular division prism 131 and the eyepiece sleeve 1 are provided.
After passing 3, the binocular observation is performed by an eyepiece lens (not shown).

Next, the operation lever 17 is moved to the three-lens-barrel body 11
2B, the prism 16 on the carrier 15 is located off the optical axis of the imaging lens 12, as shown in FIG. 2B. As a result, the observation image from the objective lens is condensed by the imaging lens 12, and then goes straight upward in the figure to be guided to the straight tube portion 113, and then to the silver salt camera or the television camera attached to the camera mount 14. It will be incident.

Therefore, according to such a first embodiment,
The prism 16 held on the carrier 15 can be inserted into and removed from the optical axis, and the prism 16 on the carrier 15 is positioned off the optical axis. Since the light is guided to 113 and is incident on a silver salt camera or a television camera attached to the camera mount 14, the prism which has been conventionally inserted for correcting the optical path difference from the binocular observation part is removed. , Straight tube part 1
It is possible to reduce the wavelength limitation of the observation light and the transmittance of the observation light by the optical path correction prism in 13 and prevent the distortion of the observation image, and it is possible to realize the measurement of the observation image with high accuracy by the silver salt camera or the television camera.

Since only the prism 16 is provided on the carrier 15 and the lens barrel is composed of one prism, the width of the lens barrel may be twice the prism width. The amount of protrusion of the tubular portion in the lateral direction is also reduced, and the visibility and operability for the microscope can be improved. (Second Embodiment) FIGS. 3 and 4 show a side cross-section and a top view of a trinocular tube applied to a microscope according to a second embodiment. In the figure, reference numeral 21 is a main body of a three-lens tube.
The spectacle tube main body 21 is provided with a binocular tube section 212 for guiding an observation image to a binocular observing section, and a silver salt camera or a television, with respect to a bottom surface section 211 that holds an imaging lens 22 that collects an observation image from an objective lens. A straight tube portion 213 is formed for guiding to another observation portion such as a camera. In this case, the binocular barrel 21
An eyepiece sleeve (not shown) is provided at the front end of 2, and a round dovetail 23 for mounting a camera mount is provided at the front end of the straight tube portion 213.

3 along the bottom surface 211 of the spectacle tube body 21
Book parallel guides 241 and 242 are arranged, and the carrier 25 is movably provided along the parallel guides 241 and 242. The carrier 25 has a hole 251 in the center, and a first prism 26 for guiding an observation image to the binocular observation unit is provided above the hole 251 via a positioning member 27. The positioning member 27 is for adjusting the position of the first prism 26 with respect to the optical axis after the first prism 26 is assembled.

The carrier 25 has a parallel guide 242.
A spring click 28 is provided so as to be opposed to and the spring click 28 is dropped into the V-shaped groove 242a of the parallel guide 242 to determine the position of the first prism 26 with respect to the optical axis. In this case, the parallel guide 24
The two V-shaped grooves 242a are formed at two locations in the axial direction of the parallel guide 242 at predetermined intervals, and these V-shaped grooves 242a are formed.
Thus, the first position where the first prism 26 coincides with the optical axis and the second position where the first prism 26 deviates from the optical axis can be set.

Further, the carrier 25 has a trinocular tube main body 21.
An operating lever 29 is provided so as to penetrate through the side wall of the carrier 25, and the carrier 25 is moved by operating the operating lever 29.
By moving the first prism 26 along the optical axis of the imaging lens 22, the first prism 26 can be moved along the optical axes 1, 242.

As shown in FIG.
The second prism 30, the first lens group 31, the third prism 32, the second lens group 33, and the fourth prism 34 that form the erecting optical system are arranged in the positional relationship shown in FIG.

Next, the operation of the embodiment thus constructed will be described. First, when the operation lever 29 is operated so as to be pushed into the trinocular tube main body 21, the first prism 26 on the carrier 25 is positioned on the optical axis of the imaging lens 22. The drawing shows this state. As a result, the observation image from the objective lens is condensed by the imaging lens 22, is then reflected by the first prism 26, and is incident on the second prism 30. And this second prism 3
The observation image is turned back in the opposite direction by 0 and is incident on the first lens group 31, where a primary image of the observation image is formed. Further, this primary image is made incident on the third prism 32, folded back in the opposite direction again, passes through the second lens group 33, and then reflected by the fourth prism 34 toward the binoculars tube portion 212 side. Then, the observation image is incident on the binoculars tube portion 212, and binocular observation is performed by an eyepiece lens (not shown).

Next, the operation lever 29 is moved to the main body 21 of the 3-glass barrel.
When it is operated to pull out with respect to
The prism 26 is moved until it is drawn into the space between the prism 26 and the second prism 30, and is positioned off the optical axis of the imaging lens 22. As a result, the observation image from the objective lens is condensed by the imaging lens 22, goes straight on, is guided to the straight tube portion 213, and is passed through a camera mount (not shown) attached to the round dovetail 23 to a silver salt camera or It comes into the TV camera.

Therefore, according to such a second embodiment,
Only the first prism 26 that reflects the observation image to the binoculars tube portion 212 side is provided on the carrier 25, and conventionally, the observation image is divided into the binoculars tube portion and other observation parts such as a silver salt camera and a television camera. Since the prism provided to guide the light is removed, and the prism inserted for the purpose of correcting the optical path difference with the binocular observation unit is also removed, the optical path correction in the straight tube portion 213 is also performed in this case. It is possible to reduce the wavelength limitation of the observation light and the transmittance of the observation light by the prism and prevent the distortion of the observation image, and it is possible to realize the measurement of the observation image with high accuracy by the silver salt camera or the television camera.

Further, the space between the first prism 26 of the erecting optical system and the second prism 30 for guiding the observation light reflected by the first prism 26 to the binoculars tube portion 212 is utilized. , The first prism 2 on the carrier 25 in this space
Since the first prism 26 is positioned off the optical axis of the imaging lens 22 by moving 6 so as to pull it in, the second prism 30 moves the first prism 26 on the carrier 25. The lateral width of the lens barrel can be reduced, and the visibility and operability to the microscope can be improved. (Third Embodiment) FIGS. 5 and 6 show a side cross section and a top view of a spectacles tube applied to a microscope according to a third embodiment. Here, FIGS. 5 and 6 correspond to FIGS.
The same parts as those in FIG.

In this case, the binoculars tube portion 212 and the straight tube portion 213 of the quadruple tube body 41 are the same as those of the trinocular tube body of the second embodiment, and the quadruple tube body 41 has another straight tube portion 411. A circular dovetail 42 for attaching the camera mount is provided at the tip of the straight tube portion 411.

The carrier 43, which is movably provided on the two parallel guides 241, 242 arranged along the bottom surface 412 of the quadruple tube body 41, has the first prism described in the second embodiment. 26 and a fifth prism 44 is provided side by side, and the fifth prism 44, the first prism 26 or the first prism 26 and the second prism 30 are moved by the movement of the carrier 43 along the parallel guides 241 and 242. The space 261 between them can be located on the optical axis of the imaging lens 22. The drawing shows a state in which the fifth prism 44 is located on the optical axis.

A third lens group 46 and a sixth prism 47 are provided on the way to the straight tube portion 411 of the quadruple tube body 41.
Is arranged, and the observation light reflected by the fifth prism 44 is guided to the straight tube portion 411 via the third lens group 46 and the sixth prism 47.

The parallel guides 241 and 2 of the carrier 43 are
The movement along 42 is such that the rotational force of the motor 48 is reduced by a gear and a belt 49 (not shown), and a driving force is given by a rotational-linear motion converting mechanism such as a pinion-rack. Further, the control of the movement amount of the carrier 43 at this time is executed by the pushing operation of the three switches 501, 502, 503 arranged on the operation panel 50 on the front surface of the spectacle tube body 41. In this case, when the switch 501 is pressed, the movement amount of the carrier 43 is controlled so that the first prism 26 is located on the optical axis, and the switch 50 is moved.
When 2 is pressed, the movement amount of the carrier 43 is controlled so that the space 261 between the first prism 26 and the second prism 30 is located on the optical axis, and when the switch 503 is pressed, The movement amount of the carrier 43 is controlled so that the prism 44 of No. 5 is located on the optical axis.

Next, the operation of the embodiment thus constructed will be described. First, when the switch 501 on the operation panel 50 is pressed, the carrier 4 is driven by the driving force from the motor 48.
3 is moved along the parallel guides 241, 242, and the first prism 26 is positioned on the optical axis from the imaging lens 22 as shown in FIG. As a result, the observation image from the objective lens is condensed by the imaging lens 22,
The light is reflected by the first prism 26 and is incident on the second prism 30. The subsequent steps are the same as those described in the second embodiment, and an observation image is incident on the binoculars tube portion 212, and binocular observation is performed by an eyepiece lens (not shown).

Next, when the switch 502 of the operation panel 50 is pushed, the carrier 43 is moved by the driving force from the motor 48 along the parallel guides 241, 242,
This time, as shown in FIG. 7B, the first prism 26
A space 261 between the second prism 30 and the second prism 30 is located on the optical axis. As a result, the observation image from the objective lens is condensed by the imaging lens 22, then goes straight through the space 261, is guided to the straight tube portion 213, and is attached to the round dovetail 23 by a camera mount (not shown). It comes to be incident on a silver salt camera or a TV camera through.

Next, when the switch 503 on the operation panel 50 is pushed, the carrier 43 is moved by the driving force from the motor 48 along the parallel guides 241, 242,
This time, as shown in FIG. 7C, the fifth prism 44
Are positioned on the optical axis from the imaging lens 22. As a result, the observation image from the objective lens is condensed by the imaging lens 22, is then reflected by the mirror coat 441 of the fifth prism 44, is guided to the third lens group 46, and is imaged once here. After being reflected, it is reflected by the mirror coat 471 of the sixth prism 47, guided to the straight tube portion 411, and made incident on a silver salt camera or a television camera through a camera mount (not shown) attached to the round ant 42. Become.

Therefore, also in the third embodiment, the prism inserted for the purpose of correcting the optical path difference with the binocular observation unit is removed in the same manner as described in the second embodiment, and therefore the optical path is changed. The correction prism can limit the wavelength of observation light, attenuate the transmittance, and prevent distortion of the observed image, and can realize highly accurate measurement of the observed image with a silver salt camera or a television camera.

Further, the space 261 between the first prism 26 of the erecting optical system and the second prism 30 for guiding the observation light reflected by the first prism 26 to the binoculars tube portion 212 is used. Then, since the optical path for guiding the observation image from the objective lens to the straight tube portion 213 as it is is formed in the space 261, the second prism 30 also in this case.
Can be arranged as close as possible to the side of the first prism 26 on the carrier 25, whereby the lateral width dimension of the lens barrel can be reduced, and the visibility and operability for the microscope can be improved. The present invention is not limited to the above-mentioned embodiments, and can be implemented by appropriately modifying it without changing the gist.

[0038]

As described above, according to the present invention, the width dimension of the lens barrel can be minimized, the wavelength limitation of the observation light and the transmittance can be attenuated, and the distortion of the observation image can be prevented. It is possible to realize highly accurate observation image measurement using a salt camera, a television camera, or the like.

[Brief description of drawings]

FIG. 1 is a side sectional view of a trinocular tube applied to a microscope according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the first embodiment.

FIG. 3 is a side sectional view of a trinocular tube applied to a microscope according to a second embodiment of the present invention.

FIG. 4 is a top view of a trinocular tube applied to the microscope according to the second example.

FIG. 5 is a side sectional view of a trinocular tube applied to a microscope according to a third embodiment of the present invention.

FIG. 6 is a top view of a trinocular tube applied to the microscope according to the third example.

FIG. 7 is a diagram for explaining the operation of the third embodiment.

FIG. 8 is a diagram showing a schematic configuration of a lens barrel of a conventional inverted optical system.

FIG. 9 is a diagram showing a schematic configuration of a lens barrel of a conventional inverted optical system.

FIG. 10 is a diagram showing a schematic configuration of a lens barrel of a conventional established optical system.

[Explanation of Codes] 11 ... 3 Glasses tube main body, 111 ... Bottom surface, 111a ... Dovetail groove, 112 ... Binoculars tube, 113 ... Straight tube portion, 12 ... Imaging lens, 13 ... Eyepiece sleeve, 14 ... Camera mount, 1
5 ... Carrier, 151 ... Hole, 16 ... Prism, 17 ... Operating lever, 21 ... 3 Spectacle tube main body, 211 ... Bottom surface, 212
... Binoculars tube part, 213 ... Straight tube part, 22 ... Imaging lens, 2
3 ... Round dovetail, 241, 242 ... Parallel guide, 242a ...
V-shaped groove, 25 ... Carrier, 251 ... Hole, 26 ... First prism, 27 ... Positioning member, 28 ... Spring click, 2
9 ... Operation lever, 30 ... Second prism, 31 ... First lens group, 32 ... Third prism, 33 ... Second lens group, 34 ... Fourth prism, 41 ... 4 Spectacle tube main body, 41
DESCRIPTION OF SYMBOLS 1 ... Straight tube part, 412 ... Bottom surface, 42 ... Round dovetail, 43 ... Carrier, 44 ... 5th prism, 46 ... 3rd lens group, 4
7 ... 6th prism, 48 ... Motor, 49 ... Belt, 5
0 ... Operation panel, 501, 502, 503 ... Switch.

Claims (3)

[Claims] 1. A microscope having a binoculars tube for guiding an observation image captured by an objective lens to a binocular observation section and a lens barrel for guiding the observation image to another observation section, and is inserted into an optical path and captured by the objective lens. A prism for guiding the observed image to the binoculars barrel, and a carrier for holding the prism and allowing the prism to be inserted into and removed from the optical path. A lens barrel characterized in that an observation image taken in from the objective lens is directly guided to the other observation part without being positioned at the position. 2. The lens barrel according to claim 1, wherein the carrier allows the prism to be inserted into and removed from the optical path according to an operation of an operation lever. 3. A microscope having a binoculars tube for guiding an observation image captured by an objective lens to a binocular observation section and a lens barrel for guiding the observation image to another observation section, and is inserted into an optical path and captured by the objective lens. The erecting optical system for guiding the observed image to the binocular barrel.
And a second prism, and a carrier that holds the first prism and allows the first prism to be inserted into and removed from the optical path. A lens barrel, wherein an observation image taken in from the objective lens without being positioned on a road is directly guided to the other observation unit through a space between the first and second prisms.